mac80211: add support for parsing ADDBA_EXT IEs

ADDBA_EXT IEs can be used to negotiate the BA fragmentation level.

Signed-off-by: John Crispin <john@phrozen.org>
Link: https://lore.kernel.org/r/20190713163642.18491-2-john@phrozen.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 8511fadc0935..f36144eda5d6 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -881,6 +881,14 @@ struct ieee80211_tpc_report_ie {
         u8 link_margin;
 } __packed;
 
+#define IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK     GENMASK(2, 1)
+#define IEEE80211_ADDBA_EXT_FRAG_LEVEL_SHIFT    1
+#define IEEE80211_ADDBA_EXT_NO_FRAG             BIT(0)
+
+struct ieee80211_addba_ext_ie {
+        u8 data;
+} __packed;
+
 struct ieee80211_mgmt {
         __le16 frame_control;
         __le16 duration;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 004e2e3adb88..c67da3575e74 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1506,6 +1506,7 @@ struct ieee802_11_elems {
         u8 max_bssid_indicator;
         u8 dtim_count;
         u8 dtim_period;
+        const struct ieee80211_addba_ext_ie *addba_ext_ie;
 
         /* length of them, respectively */
         u8 ext_capab_len;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 1b224fa27367..3441558ef2d2 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1200,6 +1200,13 @@ _ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 
                         elems->cisco_dtpc_elem = pos;
                         break;
+                case WLAN_EID_ADDBA_EXT:
+                        if (elen != sizeof(struct ieee80211_addba_ext_ie)) {
+                                elem_parse_failed = true;
+                                break;
+                        }
+                        elems->addba_ext_ie = (void *)pos;
+                        break;
                 case WLAN_EID_TIMEOUT_INTERVAL:
                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
                                 elems->timeout_int = (void *)pos;